In electronic technology field, some parameters such as three phase voltage, electron current, frequency, period, phase difference angle, active power, inactive power, apparent power etc. need be measured. The past measuring methods need many various instruments. The operations such as testability, read parameter, record etc. must be completed by man. The shorts are precision is lower and error is larger. The paper designs an alternating electric parameters measuring instrument in which the above-mentioned various parameters can simultaneously be test. It can read accurately, operate simply and can automatically record result of testability. This paper give hardware design principle chart and program design thought. The system use MCS-51 microcomputer. As the crystal vibration frequency of SCM is higher (11.059MHZ) , its presetting time of TR0 and TR1 can reach microsecond degree, we can get higher precision of all parameters and wider measurement range. The software design for the system has many features and hardware design is very simple. As the issue of alternating electric parameters measurement is always concerned about, the method put forward by the paper is practical, therefore, the system can be extended to other fields conveniently.
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